Timing chain drip leg?

I'm almost certain that at the very minimum there is a oil slinger in front of the crank gear. They likely discovered that in some industrial applications where the engine would idle at low RPM for extended periods, the slinger alone wasn't sufficient.
Just for the sake of sharing what I've seen, wear out a 318 that had the drilled through bolt at the cam plate. Since the hole is a good 1/4 inch above the floor behind it, you could find a spoon full of metal wear material collected there.